130 Square Feet of Space (57331) to Camco 57331 Olympian Wave-3 3000 BTU LP Gas Catalytic Heater Adjustable from 1600 to 3000 BTU/hr allow it to be used as a secondary heating source Wave heaters operate on low pressure gas, and can be wall mounted or used as a portable unit No electrial drain or battery connection make it the ideal solution for boondocking and dry camping Wave heaters operate silently-no fan or blower noise Equipped with a safety shut-off valve to help prevent accidental non-ignition fuel discharge The heater is rated up to 100 sq ft * depending on conditions. The * denotes that the heater rating is: Based on an outside temperature of 35oF and a R17 exterior insulation". If camping in cooler temperature or if the RV is not well insulated, a larger heater should be installed